Perhaps you should try some spelling variations:
"online sand research documents" » "online sand research comments", "online sand research catchments", "online sand research students", "online sands research documents", "online land research documents", "online island research documents", "online sind research documents", "online sale research documents", "online sao research documents"
"online rand research arguments" » "online rand research catchments", "online rand research students", "online rand research elements", "online brand research arguments", "online range research arguments", "online card research arguments", "online band research arguments", "online random research arguments"
"online hand search document" » "online band search document", "online handel search document", "online brand search document", "online hana search document", "online hard search document", "online add search document"
"online paid search document" » "online part search document", "online path search document", "online page search document", "online grid search document", "online based search document"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("online hand search document") OR ("online paid search document"))) OR ("online sand research documents"))) OR ("online rand research arguments")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"online hand search document\") OR (\"online paid search document\"))) or (\"online sand research documents\"))) or (\"online rand research arguments\"))".
• Removing quotes may allow a broader search: (((((( online hand search document ) OR ( online paid search document ))) or ( online sand research documents ))) or ( online rand research arguments )).
• Adding a wildcard symbol may retrieve word variants: (((((("online hand search document") OR ("online paid search document"))) or ("online sand research documents"))) or ("online rand research arguments"))*.